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nss-ecm: fix logic in rule addition

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When using `nft insert rule` the rule is inserted on top of the
`forward_wan` chain, which bypasses any filtering in place. Instead,
append the rule to the end of the chain.

Other changes include renaming chain `RATE-LIMIT` to `ECM-RATE-LIMIT`
for better rule classification, and `shellformat` formatting.

Signed-off-by: Sean Khan <datapronix@protonmail.com>
This commit is contained in:
Sean Khan 2024-07-08 11:12:44 -04:00
parent 4c8e0ae9f2
commit baed4d5a9e
1 changed files with 23 additions and 22 deletions
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45
qca-nss-ecm/files/qca-nss-ecm.firewall
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@ -3,31 +3,32 @@
FW_SCRIPT="/etc/init.d/firewall"
if grep -q "fw3" "$FW_SCRIPT"; then
if ! iptables -nvL | grep -q "Chain RATE-LIMIT"; then
iptables -N RATE-LIMIT
if ! iptables -nvL | grep -q "Chain ECM-RATE-LIMIT"; then
iptables -N ECM-RATE-LIMIT
fi
iptables -F ECM-RATE-LIMIT
iptables -A ECM-RATE-LIMIT --match limit --limit 1000/sec --limit-burst 1000 -j RETURN
iptables -A ECM-RATE-LIMIT -j DROP
iptables -I zone_wan_forward 5 --match conntrack --ctstate NEW -j ECM-RATE-LIMIT
[ -n "$(command -v ip6tables)" ] && {
if ! ip6tables -nvL | grep -q "Chain ECM-RATE-LIMIT"; then
ip6tables -N ECM-RATE-LIMIT
fi
iptables -F RATE-LIMIT
iptables -A RATE-LIMIT --match limit --limit 1000/sec --limit-burst 1000 -j RETURN
iptables -A RATE-LIMIT -j DROP
iptables -I zone_wan_forward 5 --match conntrack --ctstate NEW -j RATE-LIMIT
[ -n "$(command -v ip6tables)" ] && {
if ! ip6tables -nvL | grep -q "Chain RATE-LIMIT"; then
ip6tables -N RATE-LIMIT
fi
ip6tables -F RATE-LIMIT
ip6tables -A RATE-LIMIT --match limit --limit 1000/sec --limit-burst 1000 -j RETURN
ip6tables -A RATE-LIMIT -j DROP
ip6tables -I zone_wan_forward 5 --match conntrack --ctstate NEW -j RATE-LIMIT
}
ip6tables -F ECM-RATE-LIMIT
ip6tables -A ECM-RATE-LIMIT --match limit --limit 1000/sec --limit-burst 1000 -j RETURN
ip6tables -A ECM-RATE-LIMIT -j DROP
ip6tables -I zone_wan_forward 5 --match conntrack --ctstate NEW -j ECM-RATE-LIMIT
}
elif grep -q "fw4" "$FW_SCRIPT"; then
if ! nft list chain inet fw4 RATE-LIMIT > /dev/null 2>&1; then
nft add chain inet fw4 RATE-LIMIT
fi
if ! nft list chain inet fw4 ecm_rate_limit > /dev/null 2>&1; then
nft add chain inet fw4 ecm_rate_limit
fi
nft add rule inet fw4 RATE-LIMIT limit rate 1000/second burst 1000 packets counter return
nft add rule inet fw4 RATE-LIMIT counter drop
nft insert rule inet fw4 forward_wan ct state new counter jump RATE-LIMIT
nft add rule inet fw4 ecm_rate_limit limit rate 1000/second burst 1000 packets counter return
nft add rule inet fw4 ecm_rate_limit counter drop
nft add rule inet fw4 forward_wan ct state new counter jump ecm_rate_limit comment "!fw4: ECM Rate Limit 1000/pps"
fi